[Linux] Low FPS and crackling audio with kernel 6.10.4

[staticf0x]

Your system information

• System Information
• Have you checked for system updates?: Yes
• Are you using the latest stable video driver available for your system? Yes
• Have you verified the game files?: Yes
• Launch options: %command% -sdl_displayindex 0 dota_mouse_window_lock 0 -sdlaudiodriver pulse

Please describe your issue in as much detail as possible:

Since today when I updated my system, my FPS dropped to ~30 from >60 and I hear a crackling sound. The low FPS can be seen both in menu and in game.
Tried without -sdlaudiodriver pulse, same issue. Tried restarting PC, no apps opened, still happens. Tried disabling second monitor, still same.
Possible culprits during the system update: kernel 6.9.12 -> 6.10.4, libwayland* 1.22 -> 1.23, mutter 46.3 -> 46.4

Steps for reproducing this issue:

Just start DotA2 with a similar setup, it happens every time straight from startup.

[staticf0x]

I tried booting up kernel 6.9.12 back and I have 120 FPS like usually. So the problem is kernel 6.10.4 but I don't know why.

[kisak-valve]

Hello @staticf0x, this issue should also be reported to your video driver vendor if it hasn't been already.

[jn64]

Possibly related:
https://gitlab.freedesktop.org/drm/amd/-/issues/3528

The thread is quite long, you can start around here and try similar steps (disable CSM, enable rebar).
https://gitlab.freedesktop.org/drm/amd/-/issues/3528#note_2517761

[esubalol]

Some of us managed to solve the performance issues on 6.10.4 by disabling CSM support in the BIOS, as documented in this issue: #2749

[staticf0x]

Thank you, I tried disabling CSM support, but it helps only a little bit:

Kernel	CSM	FPS
6.10.4	Enabled	~30
6.10.4	Disabled	~40
6.9.12	-	120

I'll keep an eye on the linked amd gitlab issues.

[eeceebee]

Thank you, I tried disabling CSM support, but it helps only a little bit:
Kernel CSM FPS
6.10.4 Enabled ~30
6.10.4 Disabled ~40
6.9.12 - 120

I'll keep an eye on the linked amd gitlab issues.

This is very similar to what I'm experiencing. Disabling CSM helps a bit, but FPS is still much worse (and less stable) than with the previous kernel.

[jn64]

Is Xwayland using a lot of CPU when you experience this low FPS?

There may be a 2nd issue compounding with the CSM/rebar issue.

https://gitlab.freedesktop.org/drm/amd/-/issues/3528#note_2524173
https://gitlab.freedesktop.org/drm/amd/-/issues/3538

[SniksBjorn]

Not sure if this is helpful but will add my experience.
I don't play Dota 2 but do play CS2 and am having the same problem there. I have installed Dota 2 to test both for this comment.
To start with the problem for me is with all 6.10 kernals using xorg or wayland. I previously had rebar disabled due to a crash it caused in RDR2 so I have just turned it back on and it seems to have fixed the low fps.
To me this shows the problem could be independent to CSM disabling rebar and instead be something else causing rebar to be needed for the games to run smoothly.

I don't know how to check if rebar is working but I think it would be good to see if CSM was disabling rebar in previous kernal versions.

[staticf0x]

Since linux 6.10.10 the FPS got slightly better up to around 60 FPS, but the performance is still noticeably better on 6.9.x with 120 FPS.

[MaCroX95]

I can confirm this issue, and since https://gitlab.freedesktop.org/drm/amd/-/issues/3528#note_2517761 is already closed and people there are saying that the issue is fixed I reiterate - IT IS NOT! I'm getting barely 60fps on 6.11.4 compared to 120fps on 6.9 series... This needs to be looked into by the devs of the source engine for a workaround or at least work from valve to help with the upstream fix... Dota 2 is basically one of the most played games on steam and the situation right now is horrible...

[baaannnaaannn]

I can confirm this issue, and since https://gitlab.freedesktop.org/drm/amd/-/issues/3528#note_2517761 is already closed and people there are saying that the issue is fixed I reiterate - IT IS NOT! I'm getting barely 60fps on 6.11.4 compared to 120fps on 6.9 series... This needs to be looked into by the devs of the source engine for a workaround or at least work from valve to help with the upstream fix... Dota 2 is basically one of the most played games on steam and the situation right now is horrible...

I can confirm,issue still exist but video driver vendors says that its fixed.What the hell....